void scatplot (dot) SVC.C Level 3
int dot = 1 for points only in curve()
= 0 to return to lines in curve().
For drawing scatter plots,  scatplot() sets a flag that causes curve() to draw points only. If the last argument to curve() is a 0, curve() will draw a dot at every point. Otherwise curve() will behave normally. See curve().

Scatter plots can also be drawn using symbol 16 and calling curve(x, y, npts, -1).